Another pipeline, the Northern Border Pipeline, has safely operated beneath Lake Oahe since 1982. DAPL follows the same route as Northern Border, but is much deeper below the bottom of the lake. Built in 1982, the existing non-DAPL owned dual 42-inch pipelines are about five feet below the mud floor of Lake Oahe; the Dakota Access Pipeline will be installed about 95 to 115 feet below the bottom of Lake Oahe.
No part of the pipeline comes in contact with water from the Missouri River or Lake Oahe.
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